Our expert says:
There appear to be two issues here. The discharge and abdominal pain could be indicators of an STI so rather check it out rather than leave it.
As for the size of his penis - if it is a girth (or width) issue, then plenty of good lubricant (not KY jelly, something like Sylk, or Durex Play, or Astroglide, etc) and taking it slow with you in control of the pace. It could also help if you assist your pelvic floor muscles to relax by 'bearing down' as if you are trying to push out (this ironically relaxes the muscles - think about what happens in natural childbirth). The female superior position also tends to open up the pelvis and thus the structural limitations.
If length is also an issue, then you need to instruct him on shallower penetration, it might help for him to put his hand/fingers around the base of his penis and agains his pelvis to prevent the deeper penetration.
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